Key parameters at a glance

A radius of 13.20 Earth radii
A mass of 945.22 Earth masses
Surface gravity around 5.42 g
An orbital period of 557.700 days
Semi-major axis 1.3490 AU
Distance from Earth 187.93 light-years
Earth Similarity Index 0.395
Travel time at Voyager 1 speed 3,314,205 years

2 siblings around HD 125612

HD 125612 b shares its host star with 2 other confirmed planets. Side-by-side measurements below.

Planet	Type	Radius (R⊕)	Mass (M⊕)	Period (d)	Eq. T (K)	Year
HD 125612 c	Neptune-like	4.07	15.57	4.155	—	2009
HD 125612 b this	Gas Giant	13.20	945.22	557.700	—	2007
HD 125612 d	Gas Giant	12.70	2,281.37	2,822.727	—	2009

HD 125612 b Planet Profile

Physical Specs

Radius

13.20 R⊕

Radius (Jupiter)

1.170 R♃

Mass

945.22 M⊕

Mass (Jupiter)

2.974 M♃

Density

2.26 g/cm³

Surface Gravity

5.42 g (Earth)

Classification

Planet Type

Gas Giant

ESI Score 0.395

HZ Position Unknown

Controversial No

Discovery

Year 2007

Method Radial Velocity

Facility W. M. Keck Observatory

Telescope 10 m Keck I Telescope

Size rank in cohort

Rank by radius

#847of 1771

top 47.8%

This planet

13.20R⊕

Gas Giant median

13.52R⊕

Nearest-size peers

HD 12661 c 13.20 R⊕ HD 37605 b 13.20 R⊕ MOA-2009-BLG-387L b 13.20 R⊕

Metric	Earth	HD 125612 b	Jupiter
Radius (R⊕)	1.00	13.20	11.21
Mass (M⊕)	1.00	945.22	317.83
Density (g/cm³)	5.51	2.26	1.33
Surface Gravity (g)	1.00	5.42	2.53
Insolation (S⊕)	1.00	—	0.037

Alternative Mass Estimates

Method	Value	Interpretation
Minimum mass (M sin i)	945.222 M⊕	Lower bound from radial-velocity fitting.

Star Catalogue Identifiers

HD 125612

HIP

HIP 70123

TIC

TIC 347909637

Gaia DR2

Gaia DR2 6296703260330865536

Gaia DR3

Gaia DR3 6296703260330865536

System

HD 125612

Percentile among Gas Giant cohort

Radius 13.200 R⊕ · percentile 49 / cohort 1771

Mass 945.222 M⊕ · percentile 65 / cohort 1747

Orbital period 557.70 d · percentile 69 / cohort 1533

Distance 57.62 pc · percentile 24 / cohort 1759

ESI 0.395 · percentile 84 / cohort 1771

Orbit & Habitability

Orbital Dynamics

Period

557.700 days

Semi-major axis

1.3490 AU

Eccentricity

0.446

Inclination

— °

Year Length

A year here lasts about 1.53 Earth years on a highly eccentric trajectory at a mean orbital distance of 1.3490 AU.

Eq. Temperature

—

Insolation (S⊕)

—

Earth = 1.00

Earth Similarity (ESI)

0.395

0 = alien, 1 = Earth-identical

Discovery Paper

Primary reference

Fischer et al. 2007

Instrument

HIRES Spectrometer

Publication

2007-11

Observation locale

Ground

Discovery cohort

Planets confirmed in 2007 at W. M. Keck Observatory (7 shown).

HD 11506 b · Gas Giant HD 75898 b · Gas Giant GJ 317 b · Gas Giant HD 5319 b · Gas Giant HD 231701 b · Gas Giant HD 170469 b · Gas Giant HD 175541 b · Gas Giant

Host System: HD 125612

Spectral Class

G-type yellow (Sun-like)

Effective Temperature

5,900 K — hotter than the Sun (5,778 K)

Estimated Age

1.77 Gyr — younger than the Sun (4.6 Gyr)

Stellar Radius

1.070 R☉

Stellar Mass

1.050 M☉

Metallicity [Fe/H]

0.23

Extended Stellar Properties

Surface gravity (log g)

4.450 dex

Stellar density

1.017 g/cm³

Systemic radial velocity

-18.40 km/s

Rotational v·sin i

2.10 km/s

Rotation period

10.50 days

Metallicity ratio

[Fe/H]

Distance

57.62 parsec

Light-years 187.93 ly

V-band magnitude

8.31 mag

Voyager-speed travel 3,314,205 yr

Multi-band Host Photometry — 11 bands

Astrometric Data

Parallax

17.326 mas

Total Proper Motion

90.389 mas/yr

PM Right Ascension

-60.26 mas/yr

PM Declination

-67.37 mas/yr

Galactic Cartesian (pc)

x = -0.779 · y = -0.550 · z = -0.300

Equatorial (J2000)

RA 215.22272° · Dec -17.48181°

Galactic ℓ, b

331.389° · 40.395°

Ecliptic λ, β

218.695° · -3.256°

HTM-20 index

1449905202

Observation Record

Photometric series

RV measurements

Stellar spectra

Archive notes